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135 lines
3.2 KiB
135 lines
3.2 KiB
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nomeminfo_numa
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package collector
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"path"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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memInfoNumaSubsystem = "memory_numa"
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)
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type meminfoKey struct {
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metricName, numaNode string
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}
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type meminfoNumaCollector struct {
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metricDescs map[string]*prometheus.Desc
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}
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func init() {
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Factories["meminfo_numa"] = NewMeminfoNumaCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// memory stats.
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func NewMeminfoNumaCollector() (Collector, error) {
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return &meminfoNumaCollector{
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metricDescs: map[string]*prometheus.Desc{},
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}, nil
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}
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func (c *meminfoNumaCollector) Update(ch chan<- prometheus.Metric) (err error) {
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memInfoNuma, err := getMemInfoNuma()
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if err != nil {
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return fmt.Errorf("couldn't get NUMA meminfo: %s", err)
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}
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for k, v := range memInfoNuma {
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desc, ok := c.metricDescs[k.metricName]
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if !ok {
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desc = prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, memInfoNumaSubsystem, k.metricName),
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fmt.Sprintf("Memory information field %s.", k.metricName),
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[]string{"node"}, nil)
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c.metricDescs[k.metricName] = desc
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}
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ch <- prometheus.MustNewConstMetric(desc, prometheus.GaugeValue, v, k.numaNode)
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}
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return nil
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}
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func getMemInfoNuma() (map[meminfoKey]float64, error) {
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info := make(map[meminfoKey]float64)
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nodes, err := filepath.Glob(sysFilePath("devices/system/node/node[0-9]*"))
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if err != nil {
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return nil, err
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}
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for _, node := range nodes {
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file, err := os.Open(path.Join(node, "meminfo"))
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if err != nil {
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return nil, err
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}
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defer file.Close()
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numaInfo, err := parseMemInfoNuma(file)
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if err != nil {
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return nil, err
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}
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for k, v := range numaInfo {
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info[k] = v
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}
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}
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return info, nil
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}
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func parseMemInfoNuma(r io.Reader) (map[meminfoKey]float64, error) {
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var (
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memInfo = map[meminfoKey]float64{}
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scanner = bufio.NewScanner(r)
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re = regexp.MustCompile("\\((.*)\\)")
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)
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for scanner.Scan() {
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line := strings.TrimSpace(scanner.Text())
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if line == "" {
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continue
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}
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parts := strings.Fields(string(line))
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fv, err := strconv.ParseFloat(parts[3], 64)
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if err != nil {
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return nil, fmt.Errorf("invalid value in meminfo: %s", err)
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}
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switch l := len(parts); {
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case l == 4: // no unit
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case l == 5 && parts[4] == "kB": // has unit
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fv *= 1024
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default:
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return nil, fmt.Errorf("invalid line in meminfo: %s", line)
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}
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metric := strings.TrimRight(parts[2], ":")
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// Active(anon) -> Active_anon
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metric = re.ReplaceAllString(metric, "_${1}")
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memInfo[meminfoKey{metric, parts[1]}] = fv
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}
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return memInfo, nil
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}
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